Saturday, 30 January 2021

Number of flood registers vs manual j s and d calculations

Hello,

I had a licensed contractor submit to the city with his permit a manual J S D calc with all the info, he did some work and got paid based on a state heat loan that I qualified for. The house reno took a while, but the floors were installed after the subfloor was drilled for floor registers.

My main concerns, in the summer it was 96 but the AC was unable to bring down the indoor temp to below 75, and it felt rather uncomfortable. He shrugged it off as that's the way it should be with the delta. I don't know much but ok..

Second concern, we have a really large living room with 10 ft ceilings and a kitchen with an 8 ft ceiling..heating would take a long time and it felt like we had dead zones for heating in several areas. Our living room is about a 28 by 28 box. I have an aquacoil and raised the temperature to 140 from 120. But this all got my really suspicious..especially with the sh&t work he did where one of the floor registers is in the wrong in floor joist bay and ended up overlapping with patio door casing..really dumb.

I asked the city to send me a copy of the manual calcs so I could research..and here's what I found..he under counted the heating/cooling load by 8000 BTU

Total Heating Required Including Ventilation Air: 31,121 Btuh 31.121 MBH
Total Sensible Gain: 19,819 Btuh 82 %
Total Latent Gain: 4,441 Btuh 18 %
Total Cooling Required Including Ventilation Air: 24,261 Btuh 2.02 Tons (Based On Sensible + Latent)

AKA he didn't correctly take into account my giant in wall glass 10ft by 10 ft, or my 6ft by 8 ft skylight..or the patio doors of which there are 3 in this space. so the Total heating, is about 8000 btu less than it should be and total cooling is probably also a little bit low. So that is already pissing me off...


Then I look further down and the calculations call for 5 registers in total if we count the kitchen which is with a lower ceiling. But he installed only 3. 2 of the 3 are next to 2 patio doors. One is in the kitchen.

Could the additional air registers help assist with properly heating the living room in a more reasonable fashion...? Should he have installed as many as the calculation stated or is it ok to have less? Should I have had such cooling issues as I did? He installed a 2.5 ton GSX160301..I think it should have been a 3.0 considering he's missing like 8000 btu in the equation...

Thanks!


source https://hvac-talk.com/vbb/showthread.php?2226195-Number-of-flood-registers-vs-manual-j-s-and-d-calculations&goto=newpost

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